Tham & Videgård have won a competition to design the +One tower in Gothenburg – a new hotel and exhibition centre entrance with pinstripe- or matchstick-like mullions, pillars and floorplates.

The 28,000sq m (301,000sq ft) development will sit alongside the city's three existing Gothia Towers and, with them, form part of the Swedish Exhibition & Congress Centre, providing new accommodation and amenities.

Its thin white mullions, pillars and floorplates will create uniform slices of an otherwise all glazed building, giving the sense of a building that is both open and intricately constructed.

The base of the tower, which will be the same height as a neighbouring 19th-century carré structure to fit with the surrounding typology, will house the new entrance for the exhibition centre, the hotel lobby and several levels of conference spaces.

Extending out from the upper portion of the building, it will also accommodate a raised, covered terrace and provide cover for part of the adjacent plaza, which will provide additional space for exhibitions, concerts and cultural events.

The more slender upper section of the tower will house four hundred hotel rooms with views of the city and the nearby sea, as well as restaurants and bars in its upper four levels to take advantage of the views.

A roof terrace will be set among the tower's façade columns that will continue upwards to create a forest of pillars above the top floor and a distinctive spiked visual feature.

Studio co-founders and project lead architects Bolle Tham and Martin Videgård said: "The architectural character of the scheme is based on the idea of a direct and open interface between the city and the venue and its role as a future beacon within the urban fabric. There are also clear ties to the history of the Swedish Exhibition & Congress Centre and its founding moments around the Gothenburg 1923 Jubilee Exhibition."

Construction is scheduled to begin in 2022 and to be completed in 2025.